For anyone looking for a solution to this issue..
I suspect that the issue affects your current user because you had “reordered” metaboxes on the edit screen.
The “fix” we added on the latest version, changes all “high” metaboxes to “normal”. This allows metaboxes to appear correctly in Gutenberg, but is most likely conflicting with your users “reorder” setting.
To change and fix this from your end, please edit the wp_usermeta table and delete the rows containing “meta-box-order_…”. This will allow all metaboxes to appear as expected.